ReadyLIFT 4 Inch (4+2) Big Lift Kit - 2025-2026 Chevy Silverado 1500 ZR2 GMC Sierra 1500 AT4X (44-35400)

This ReadyLIFT big lift kit is made for the 2025-2026 Chevy Silverado 1500 ZR2 and GMC Sierra 1500 AT4X. It adds 4 inch of lift on top of the factory 2 inch lift, for 6 inch total, and fits up to a 35x12.50 tire on a 20x9 wheel with 0 offset and no trimming. The front keeps the factory strut and geometry, and the rear uses fabricated steel blocks with integrated bump stop landings. Shocks are not included; rear shock extensions let you keep the factory performance shocks.

Key features

• Proprietary lower strut clamshell design that maintains factory geometry and keeps the factory strut in use
• Angled and offset top mount strut extensions with a lower strut pre-load spacer for a slight spring rate increase
• Fabricated steel rear blocks with integrated bump stop landings
• Rear shock extensions that retain the factory performance shocks
• 3/16 inch thick steel plate cross members and skid plate
• Anti-torsion boxed and gusseted plate steel differential drop brackets, 1/4 inch boxed plate steel

What's included

• Knuckle
• Fabricated rear blocks (driver and passenger)
• Rear brake line bracket
• Rear ABS bracket
• CV axle spacer
• Rear shock extensions and washers
• Hardware pack

Fitment and compatibility

• Fits 2025-2026 Chevy Silverado 1500 ZR2 and GMC Sierra 1500 AT4X only
• Not compatible with rear mono-leaf springs
• Use of the Auto 4 Hi feature is not recommended
• Larger aftermarket tires, often 10-ply or more and E-rated, can increase ride harshness
• Larger setups may need trimming at the front valance, felt liner edges and a mud flap edge. Test fit every tire and wheel combination; recommendations are based on Wheel Pros wheels and Nitto tires

Specifications

• Brand: ReadyLIFT
• Part number: 44-35400
• Kit lift: 4 inch (4+2)
• Total lift: 6 inch with the factory 2 inch lift
• Max tire: 35x12.50 on a 20x9 wheel, 0 offset, no trimming
• Max tire with trimming: 35x12.50 or 325/60R20 on a 20x10 wheel, -18 offset
• Material: Steel
• Shocks included: No
• Hardware included: Yes
• Estimated install time: 10 hours, plus or minus 1 hour
• Warranty: Includes ReadyGuard Powertrain Warranty

Installation

Allow about 10 hours, plus or minus 1, not counting alignment or wheel and tire assembly. The page labels it do it yourself, but a certified mechanic is recommended. An alignment, a headlamp aim check and ADAS recalibration may be needed, at extra cost.

Modifying your suspension can change handling and rollover risk (SAE J2492). Always wear your seat belt. ReadyLIFT's page carries a California Proposition 65 warning that names DEHP.